Experimental investigation of controlled single and repeated impact testing of shot peening on Ti-6Al-4V, 300M and AA7050-T7451

Author:  H. Y. Miao, M. Singhal, M. Lévesque and E. Martin Département de Génie Mécanique, École Polytechnique de Montréal, C.P. 6079, Succ. Centre-Ville, Montréal, Québec, H3C 3A7 Canada
Source:  ICSP14 Milan
Doc ID:  2022095
Year of Publication:  2022
Abstract:  
Abstract During the shot peening process, multiple spherical shots impact the component at high velocity, causing plastic deformation in the component surface. This plastic deformation introduces beneficial subsurface compressive residual stresses. The shot peening process is governed by several important parameters that determine the shot peening results. To better understand the shot peening process and peening results on different materials, it is critical to study the effect of individual process parameters for different target materials. This paper investigates the effects of individual shot peening parameters such as shot velocity, shot diameter, angle of impact, and material properties on the diameter of the indentation and the change of the coefficient of restitution (CoR) value after a single and three repeated impacts on aerospace alloys: Titanium Ti-6Al-4V, 300M Steel and Aluminum Alloy 7050- T7451, using a single shot peening cannon. For the three studied materials, the resulting indentation diameters increase with the increase of shot diameter and shot velocity. The CoR decreases with the increase of the impact velocity and the shot diameter has very limited effect on the CoR. For multiple impacts at the same location, the CoR value increases with the increase of the number of impacts due to the previous plastic deformation. Keywords: shot peening, controlled single impact, indentation, coefficient of restitution.